#!/usr/bin/python
# -*- coding: utf-8 -*-

# Copyright: (c) 2018, Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

# There is no actual shell module source, when you use 'shell' in ansible,
# it runs the 'command' module with special arguments and it behaves differently.
# See the command source and the comment "#USE_SHELL".

from __future__ import absolute_import, division, print_function
__metaclass__ = type


ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['stableinterface'],
                    'supported_by': 'core'}


DOCUMENTATION = r'''
---
module: shell
short_description: Execute shell commands on targets
description:
     - The C(shell) module takes the command name followed by a list of space-delimited arguments.
     - Either a free form command or C(cmd) parameter is required, see the examples.
     - It is almost exactly like the M(command) module but runs
       the command through a shell (C(/bin/sh)) on the remote node.
     - For Windows targets, use the M(win_shell) module instead.
version_added: "0.2"
options:
  free_form:
    description:
      - The shell module takes a free form command to run, as a string.
      - There is no actual parameter named 'free form'.
      - See the examples on how to use this module.
    type: str
  cmd:
    type: str
    description:
      - The command to run followed by optional arguments.
  creates:
    description:
      - A filename, when it already exists, this step will B(not) be run.
    type: path
  removes:
    description:
      - A filename, when it does not exist, this step will B(not) be run.
    type: path
    version_added: "0.8"
  chdir:
    description:
      - Change into this directory before running the command.
    type: path
    version_added: "0.6"
  executable:
    description:
      - Change the shell used to execute the command.
      - This expects an absolute path to the executable.
    type: path
    version_added: "0.9"
  warn:
    description:
      - Whether to enable task warnings.
    type: bool
    default: yes
    version_added: "1.8"
  stdin:
    description:
      - Set the stdin of the command directly to the specified value.
    type: str
    version_added: "2.4"
  stdin_add_newline:
    description:
      - Whether to append a newline to stdin data.
    type: bool
    default: yes
    version_added: "2.8"
notes:
  - If you want to execute a command securely and predictably, it may be
    better to use the M(command) module instead. Best practices when writing
    playbooks will follow the trend of using M(command) unless the C(shell)
    module is explicitly required. When running ad-hoc commands, use your best
    judgement.
  - Check mode is supported when passing C(creates) or C(removes). If running
    in check mode and either of these are specified, the module will check for
    the existence of the file and report the correct changed status. If these
    are not supplied, the task will be skipped.
  - To sanitize any variables passed to the shell module, you should use
    C({{ var | quote }}) instead of just C({{ var }}) to make sure they
    do not include evil things like semicolons.
  - An alternative to using inline shell scripts with this module is to use
    the M(script) module possibly together with the M(template) module.
  - For rebooting systems, use the M(reboot) or M(win_reboot) module.
seealso:
- module: command
- module: raw
- module: script
- module: win_shell
author:
    - Ansible Core Team
    - Michael DeHaan
'''

EXAMPLES = r'''
- name: Execute the command in remote shell; stdout goes to the specified file on the remote.
  shell: somescript.sh >> somelog.txt

- name: Change the working directory to somedir/ before executing the command.
  shell: somescript.sh >> somelog.txt
  args:
    chdir: somedir/

# You can also use the 'args' form to provide the options.
- name: This command will change the working directory to somedir/ and will only run when somedir/somelog.txt doesn't exist.
  shell: somescript.sh >> somelog.txt
  args:
    chdir: somedir/
    creates: somelog.txt

# You can also use the 'cmd' parameter instead of free form format.
- name: This command will change the working directory to somedir/.
  shell:
    cmd: ls -l | grep log
    chdir: somedir/

- name: Run a command that uses non-posix shell-isms (in this example /bin/sh doesn't handle redirection and wildcards together but bash does)
  shell: cat < /tmp/*txt
  args:
    executable: /bin/bash

- name: Run a command using a templated variable (always use quote filter to avoid injection)
  shell: cat {{ myfile|quote }}

# You can use shell to run other executables to perform actions inline
- name: Run expect to wait for a successful PXE boot via out-of-band CIMC
  shell: |
    set timeout 300
    spawn ssh admin@{{ cimc_host }}

    expect "password:"
    send "{{ cimc_password }}\n"

    expect "\n{{ cimc_name }}"
    send "connect host\n"

    expect "pxeboot.n12"
    send "\n"

    exit 0
  args:
    executable: /usr/bin/expect
  delegate_to: localhost

# Disabling warnings
- name: Using curl to connect to a host via SOCKS proxy (unsupported in uri). Ordinarily this would throw a warning.
  shell: curl --socks5 localhost:9000 http://www.ansible.com
  args:
    warn: no
'''

RETURN = r'''
msg:
    description: changed
    returned: always
    type: bool
    sample: True
start:
    description: The command execution start time
    returned: always
    type: str
    sample: '2016-02-25 09:18:26.429568'
end:
    description: The command execution end time
    returned: always
    type: str
    sample: '2016-02-25 09:18:26.755339'
delta:
    description: The command execution delta time
    returned: always
    type: str
    sample: '0:00:00.325771'
stdout:
    description: The command standard output
    returned: always
    type: str
    sample: 'Clustering node rabbit@slave1 with rabbit@master …'
stderr:
    description: The command standard error
    returned: always
    type: str
    sample: 'ls: cannot access foo: No such file or directory'
cmd:
    description: The command executed by the task
    returned: always
    type: str
    sample: 'rabbitmqctl join_cluster rabbit@master'
rc:
    description: The command return code (0 means success)
    returned: always
    type: int
    sample: 0
stdout_lines:
    description: The command standard output split in lines
    returned: always
    type: list
    sample: [u'Clustering node rabbit@slave1 with rabbit@master …']
stderr_lines:
    description: The command standard error split in lines
    returned: always
    type: list
    sample: [u'ls cannot access foo: No such file or directory', u'ls …']
'''
